the file from a reputable source like Flightsim.to. Extract the contents using a tool like WinRAR or 7-Zip.
A version is available for the Heinz 787 aircraft on X-Plane.org . Download Boeing 787 Etihad Airways Grand Prix 2021 rar
(typically found in your MSFS installation directory). the file from a reputable source like Flightsim